Building Ascent+MPI+CUDA without Spack

*Building Conduit: (latest develop commit)*

cmake ../src -DCMAKE_BUILD_TYPE=Release -DBUILD_SHARED_LIBS=OFF -DENABLE_MPI=ON -G Ninja -DCMAKE_INSTALL_PREFIX=../install

*Building VTK-m: (commit* `bac7559926b328199323bb314a6dffc5d93fbe52`)

cmake .. -DVTKm_USE_DEFAULT_TYPES_FOR_ASCENT:BOOL=ON -DVTKm_CUDA_Architecture=volta -DVTKm_NO_DEPRECATED_VIRTUAL:BOOL=ON -DVTKm_USE_64BIT_IDS:BOOL=OFF -DVTKm_USE_DOUBLE_PRECISION:BOOL=ON -DCMAKE_INSTALL_PREFIX=../install -G Ninja -DCMAKE_BUILD_TYPE=Release -DVTKm_ENABLE_CUDA=ON -DVTKm_ENABLE_MPI=ON -DBUILD_SHARED_LIBS=OFF

*Building VTK-h: (commit* `76c9a1c9be0c30ef4b73cdd5ae0820bb4408b853`)

cmake ../src -DENABLE_CUDA=ON -DENABLE_MPI=ON -DCMAKE_BUILD_TYPE=Release -DCMAKE_INSTALL_PREFIX=../install -DBUILD_SHARED_LIBS=OFF -G Ninja -DVTKM_DIR=../../vtk-m/install

*Building Ascent: (latest develop commit)*

cmake ../src -DBUILD_SHARED_LIBS=OFF -DENABLE_FORTRAN=OFF -DENABLE_PYTHON=OFF -DENABLE_MPI=ON -DENABLE_CUDA=ON -DENABLE_EXAMPLES=OFF -DENABLE_DOCS=OFF -DCMAKE_BUILD_TYPE=Release -G Ninja -DCONDUIT_DIR=../../conduit/install -DVTKH_DIR=../../vtk-h/install -DVTKM_DIR=../../vtk-m/install -DCMAKE_INSTALL_PREFIX=../install

*Two modifications to ascent/CMakeLists.txt are needed:*

% git diff
diff --git a/scripts/uberenv_configs/spack_configs b/scripts/uberenv_configs/spack_configs
index 368155f2..26ea4126 160000
--- a/scripts/uberenv_configs/spack_configs
+++ b/scripts/uberenv_configs/spack_configs
@@ -1 +1 @@
-Subproject commit 368155f2640ebe4050dc393e98a908523d09f9ad
+Subproject commit 26ea4126cd9ed74f9c705f8da1898bafe6248807
diff --git a/src/ascent/CMakeLists.txt b/src/ascent/CMakeLists.txt
index fe9ce937..2304abeb 100644
--- a/src/ascent/CMakeLists.txt
+++ b/src/ascent/CMakeLists.txt
@@ -403,7 +403,7 @@ if (ENABLE_SERIAL)
                           vtkm_cont
                           vtkm_cont_testing
                           vtkm_lodepng
-                          vtkmdiympi_nompi
+#                          vtkmdiympi_nompi
                           )

       source_objects(${binary_dir}
@@ -537,7 +537,7 @@ if(MPI_FOUND)
                           vtkm_cont
                           vtkm_cont_testing
                           vtkm_lodepng
-                          vtkmdiympi_nompi
+#                          vtkmdiympi_nompi
                           )

       source_objects(${binary_dir}